Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Public Key Encryption |
| 4 | * |
| 5 | * Copyright (c) 2015, Intel Corporation |
| 6 | * Authors: Tadeusz Struk <tadeusz.struk@intel.com> |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 7 | */ |
Herbert Xu | 035d78a | 2023-02-16 18:35:13 +0800 | [diff] [blame] | 8 | #include <crypto/internal/akcipher.h> |
| 9 | #include <linux/cryptouser.h> |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 10 | #include <linux/errno.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/module.h> |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 13 | #include <linux/scatterlist.h> |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 14 | #include <linux/seq_file.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/string.h> |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 17 | #include <net/netlink.h> |
Herbert Xu | 035d78a | 2023-02-16 18:35:13 +0800 | [diff] [blame] | 18 | |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 19 | #include "internal.h" |
| 20 | |
Herbert Xu | 6cb8815 | 2023-06-15 18:28:48 +0800 | [diff] [blame] | 21 | #define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 22 | |
Herbert Xu | c0f9e01 | 2023-02-16 18:35:28 +0800 | [diff] [blame] | 23 | static int __maybe_unused crypto_akcipher_report( |
| 24 | struct sk_buff *skb, struct crypto_alg *alg) |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 25 | { |
| 26 | struct crypto_report_akcipher rakcipher; |
| 27 | |
Eric Biggers | 37db69e | 2018-11-03 14:56:03 -0700 | [diff] [blame] | 28 | memset(&rakcipher, 0, sizeof(rakcipher)); |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 29 | |
Eric Biggers | 37db69e | 2018-11-03 14:56:03 -0700 | [diff] [blame] | 30 | strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 31 | |
Eric Biggers | 37db69e | 2018-11-03 14:56:03 -0700 | [diff] [blame] | 32 | return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, |
| 33 | sizeof(rakcipher), &rakcipher); |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 34 | } |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 35 | |
| 36 | static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) |
Gideon Israel Dsouza | d8c34b9 | 2016-12-31 21:26:23 +0530 | [diff] [blame] | 37 | __maybe_unused; |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 38 | |
| 39 | static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) |
| 40 | { |
| 41 | seq_puts(m, "type : akcipher\n"); |
| 42 | } |
| 43 | |
| 44 | static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm) |
| 45 | { |
| 46 | struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); |
| 47 | struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); |
| 48 | |
| 49 | alg->exit(akcipher); |
| 50 | } |
| 51 | |
| 52 | static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm) |
| 53 | { |
| 54 | struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); |
| 55 | struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); |
| 56 | |
| 57 | if (alg->exit) |
| 58 | akcipher->base.exit = crypto_akcipher_exit_tfm; |
| 59 | |
| 60 | if (alg->init) |
| 61 | return alg->init(akcipher); |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 66 | static void crypto_akcipher_free_instance(struct crypto_instance *inst) |
| 67 | { |
| 68 | struct akcipher_instance *akcipher = akcipher_instance(inst); |
| 69 | |
| 70 | akcipher->free(akcipher); |
| 71 | } |
| 72 | |
Herbert Xu | 035d78a | 2023-02-16 18:35:13 +0800 | [diff] [blame] | 73 | static int __maybe_unused crypto_akcipher_report_stat( |
| 74 | struct sk_buff *skb, struct crypto_alg *alg) |
| 75 | { |
| 76 | struct akcipher_alg *akcipher = __crypto_akcipher_alg(alg); |
| 77 | struct crypto_istat_akcipher *istat; |
| 78 | struct crypto_stat_akcipher rakcipher; |
| 79 | |
| 80 | istat = akcipher_get_stat(akcipher); |
| 81 | |
| 82 | memset(&rakcipher, 0, sizeof(rakcipher)); |
| 83 | |
| 84 | strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); |
| 85 | rakcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt); |
| 86 | rakcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen); |
| 87 | rakcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt); |
| 88 | rakcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen); |
| 89 | rakcipher.stat_sign_cnt = atomic64_read(&istat->sign_cnt); |
| 90 | rakcipher.stat_verify_cnt = atomic64_read(&istat->verify_cnt); |
| 91 | rakcipher.stat_err_cnt = atomic64_read(&istat->err_cnt); |
| 92 | |
| 93 | return nla_put(skb, CRYPTOCFGA_STAT_AKCIPHER, |
| 94 | sizeof(rakcipher), &rakcipher); |
| 95 | } |
| 96 | |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 97 | static const struct crypto_type crypto_akcipher_type = { |
| 98 | .extsize = crypto_alg_extsize, |
| 99 | .init_tfm = crypto_akcipher_init_tfm, |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 100 | .free = crypto_akcipher_free_instance, |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 101 | #ifdef CONFIG_PROC_FS |
| 102 | .show = crypto_akcipher_show, |
| 103 | #endif |
Ondrej Mosnacek | b8969a1 | 2023-05-02 10:02:33 +0200 | [diff] [blame] | 104 | #if IS_ENABLED(CONFIG_CRYPTO_USER) |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 105 | .report = crypto_akcipher_report, |
Herbert Xu | c0f9e01 | 2023-02-16 18:35:28 +0800 | [diff] [blame] | 106 | #endif |
Herbert Xu | 035d78a | 2023-02-16 18:35:13 +0800 | [diff] [blame] | 107 | #ifdef CONFIG_CRYPTO_STATS |
| 108 | .report_stat = crypto_akcipher_report_stat, |
| 109 | #endif |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 110 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
Herbert Xu | 6cb8815 | 2023-06-15 18:28:48 +0800 | [diff] [blame] | 111 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 112 | .type = CRYPTO_ALG_TYPE_AKCIPHER, |
| 113 | .tfmsize = offsetof(struct crypto_akcipher, base), |
| 114 | }; |
| 115 | |
Eric Biggers | 73bed26 | 2020-01-02 19:58:47 -0800 | [diff] [blame] | 116 | int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, |
| 117 | struct crypto_instance *inst, |
| 118 | const char *name, u32 type, u32 mask) |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 119 | { |
| 120 | spawn->base.frontend = &crypto_akcipher_type; |
Eric Biggers | de95c95 | 2020-01-02 19:58:48 -0800 | [diff] [blame] | 121 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 122 | } |
| 123 | EXPORT_SYMBOL_GPL(crypto_grab_akcipher); |
| 124 | |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 125 | struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type, |
| 126 | u32 mask) |
| 127 | { |
| 128 | return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask); |
| 129 | } |
| 130 | EXPORT_SYMBOL_GPL(crypto_alloc_akcipher); |
| 131 | |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 132 | static void akcipher_prepare_alg(struct akcipher_alg *alg) |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 133 | { |
Herbert Xu | 035d78a | 2023-02-16 18:35:13 +0800 | [diff] [blame] | 134 | struct crypto_istat_akcipher *istat = akcipher_get_stat(alg); |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 135 | struct crypto_alg *base = &alg->base; |
| 136 | |
| 137 | base->cra_type = &crypto_akcipher_type; |
| 138 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
| 139 | base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER; |
Herbert Xu | 035d78a | 2023-02-16 18:35:13 +0800 | [diff] [blame] | 140 | |
| 141 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) |
| 142 | memset(istat, 0, sizeof(*istat)); |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 143 | } |
| 144 | |
Vitaly Chikunov | 78a0324f | 2019-04-11 18:51:13 +0300 | [diff] [blame] | 145 | static int akcipher_default_op(struct akcipher_request *req) |
| 146 | { |
| 147 | return -ENOSYS; |
| 148 | } |
| 149 | |
Ignat Korchagin | bc155c6c | 2022-08-31 19:37:06 +0100 | [diff] [blame] | 150 | static int akcipher_default_set_key(struct crypto_akcipher *tfm, |
| 151 | const void *key, unsigned int keylen) |
| 152 | { |
| 153 | return -ENOSYS; |
| 154 | } |
| 155 | |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 156 | int crypto_register_akcipher(struct akcipher_alg *alg) |
| 157 | { |
| 158 | struct crypto_alg *base = &alg->base; |
| 159 | |
Vitaly Chikunov | 78a0324f | 2019-04-11 18:51:13 +0300 | [diff] [blame] | 160 | if (!alg->sign) |
| 161 | alg->sign = akcipher_default_op; |
| 162 | if (!alg->verify) |
| 163 | alg->verify = akcipher_default_op; |
| 164 | if (!alg->encrypt) |
| 165 | alg->encrypt = akcipher_default_op; |
| 166 | if (!alg->decrypt) |
| 167 | alg->decrypt = akcipher_default_op; |
Ignat Korchagin | bc155c6c | 2022-08-31 19:37:06 +0100 | [diff] [blame] | 168 | if (!alg->set_priv_key) |
| 169 | alg->set_priv_key = akcipher_default_set_key; |
Vitaly Chikunov | 78a0324f | 2019-04-11 18:51:13 +0300 | [diff] [blame] | 170 | |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 171 | akcipher_prepare_alg(alg); |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 172 | return crypto_register_alg(base); |
| 173 | } |
| 174 | EXPORT_SYMBOL_GPL(crypto_register_akcipher); |
| 175 | |
| 176 | void crypto_unregister_akcipher(struct akcipher_alg *alg) |
| 177 | { |
| 178 | crypto_unregister_alg(&alg->base); |
| 179 | } |
| 180 | EXPORT_SYMBOL_GPL(crypto_unregister_akcipher); |
| 181 | |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 182 | int akcipher_register_instance(struct crypto_template *tmpl, |
| 183 | struct akcipher_instance *inst) |
| 184 | { |
Eric Biggers | d4fdc2d | 2020-01-02 20:04:40 -0800 | [diff] [blame] | 185 | if (WARN_ON(!inst->free)) |
| 186 | return -EINVAL; |
Andrzej Zaborowski | 28a4618 | 2015-12-05 17:09:33 +0100 | [diff] [blame] | 187 | akcipher_prepare_alg(&inst->alg); |
| 188 | return crypto_register_instance(tmpl, akcipher_crypto_instance(inst)); |
| 189 | } |
| 190 | EXPORT_SYMBOL_GPL(akcipher_register_instance); |
| 191 | |
Herbert Xu | 6cb8815 | 2023-06-15 18:28:48 +0800 | [diff] [blame] | 192 | int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data) |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 193 | { |
| 194 | unsigned int reqsize = crypto_akcipher_reqsize(data->tfm); |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 195 | struct akcipher_request *req; |
| 196 | struct scatterlist *sg; |
Herbert Xu | 891ebfd | 2023-06-26 18:33:44 +0800 | [diff] [blame] | 197 | unsigned int mlen; |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 198 | unsigned int len; |
| 199 | u8 *buf; |
| 200 | |
Herbert Xu | 891ebfd | 2023-06-26 18:33:44 +0800 | [diff] [blame] | 201 | if (data->dst) |
| 202 | mlen = max(data->slen, data->dlen); |
| 203 | else |
| 204 | mlen = data->slen + data->dlen; |
| 205 | |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 206 | len = sizeof(*req) + reqsize + mlen; |
| 207 | if (len < mlen) |
| 208 | return -EOVERFLOW; |
| 209 | |
| 210 | req = kzalloc(len, GFP_KERNEL); |
| 211 | if (!req) |
| 212 | return -ENOMEM; |
| 213 | |
| 214 | data->req = req; |
Herbert Xu | 767cfee | 2023-06-26 18:20:25 +0800 | [diff] [blame] | 215 | akcipher_request_set_tfm(req, data->tfm); |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 216 | |
| 217 | buf = (u8 *)(req + 1) + reqsize; |
| 218 | data->buf = buf; |
| 219 | memcpy(buf, data->src, data->slen); |
| 220 | |
Herbert Xu | 891ebfd | 2023-06-26 18:33:44 +0800 | [diff] [blame] | 221 | sg = &data->sg; |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 222 | sg_init_one(sg, buf, mlen); |
Herbert Xu | 891ebfd | 2023-06-26 18:33:44 +0800 | [diff] [blame] | 223 | akcipher_request_set_crypt(req, sg, data->dst ? sg : NULL, |
| 224 | data->slen, data->dlen); |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 225 | |
| 226 | crypto_init_wait(&data->cwait); |
| 227 | akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, |
| 228 | crypto_req_done, &data->cwait); |
| 229 | |
| 230 | return 0; |
| 231 | } |
Herbert Xu | 6cb8815 | 2023-06-15 18:28:48 +0800 | [diff] [blame] | 232 | EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep); |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 233 | |
Herbert Xu | 6cb8815 | 2023-06-15 18:28:48 +0800 | [diff] [blame] | 234 | int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err) |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 235 | { |
| 236 | err = crypto_wait_req(err, &data->cwait); |
Herbert Xu | 486bfb0 | 2023-06-27 17:59:32 +0800 | [diff] [blame] | 237 | if (data->dst) |
| 238 | memcpy(data->dst, data->buf, data->dlen); |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 239 | data->dlen = data->req->dst_len; |
| 240 | kfree_sensitive(data->req); |
| 241 | return err; |
| 242 | } |
Herbert Xu | 6cb8815 | 2023-06-15 18:28:48 +0800 | [diff] [blame] | 243 | EXPORT_SYMBOL_GPL(crypto_akcipher_sync_post); |
Herbert Xu | addde1f | 2023-06-15 18:28:46 +0800 | [diff] [blame] | 244 | |
| 245 | int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm, |
| 246 | const void *src, unsigned int slen, |
| 247 | void *dst, unsigned int dlen) |
| 248 | { |
| 249 | struct crypto_akcipher_sync_data data = { |
| 250 | .tfm = tfm, |
| 251 | .src = src, |
| 252 | .dst = dst, |
| 253 | .slen = slen, |
| 254 | .dlen = dlen, |
| 255 | }; |
| 256 | |
| 257 | return crypto_akcipher_sync_prep(&data) ?: |
| 258 | crypto_akcipher_sync_post(&data, |
| 259 | crypto_akcipher_encrypt(data.req)); |
| 260 | } |
| 261 | EXPORT_SYMBOL_GPL(crypto_akcipher_sync_encrypt); |
| 262 | |
| 263 | int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm, |
| 264 | const void *src, unsigned int slen, |
| 265 | void *dst, unsigned int dlen) |
| 266 | { |
| 267 | struct crypto_akcipher_sync_data data = { |
| 268 | .tfm = tfm, |
| 269 | .src = src, |
| 270 | .dst = dst, |
| 271 | .slen = slen, |
| 272 | .dlen = dlen, |
| 273 | }; |
| 274 | |
| 275 | return crypto_akcipher_sync_prep(&data) ?: |
| 276 | crypto_akcipher_sync_post(&data, |
| 277 | crypto_akcipher_decrypt(data.req)) ?: |
| 278 | data.dlen; |
| 279 | } |
| 280 | EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt); |
| 281 | |
Herbert Xu | 6cb8815 | 2023-06-15 18:28:48 +0800 | [diff] [blame] | 282 | static void crypto_exit_akcipher_ops_sig(struct crypto_tfm *tfm) |
| 283 | { |
| 284 | struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm); |
| 285 | |
| 286 | crypto_free_akcipher(*ctx); |
| 287 | } |
| 288 | |
| 289 | int crypto_init_akcipher_ops_sig(struct crypto_tfm *tfm) |
| 290 | { |
| 291 | struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm); |
| 292 | struct crypto_alg *calg = tfm->__crt_alg; |
| 293 | struct crypto_akcipher *akcipher; |
| 294 | |
| 295 | if (!crypto_mod_get(calg)) |
| 296 | return -EAGAIN; |
| 297 | |
| 298 | akcipher = crypto_create_tfm(calg, &crypto_akcipher_type); |
| 299 | if (IS_ERR(akcipher)) { |
| 300 | crypto_mod_put(calg); |
| 301 | return PTR_ERR(akcipher); |
| 302 | } |
| 303 | |
| 304 | *ctx = akcipher; |
| 305 | tfm->exit = crypto_exit_akcipher_ops_sig; |
| 306 | |
| 307 | return 0; |
| 308 | } |
| 309 | EXPORT_SYMBOL_GPL(crypto_init_akcipher_ops_sig); |
| 310 | |
Tadeusz Struk | 3c339ab | 2015-06-16 10:30:55 -0700 | [diff] [blame] | 311 | MODULE_LICENSE("GPL"); |
Tadeusz Struk | 338a9de | 2015-06-23 10:18:53 -0700 | [diff] [blame] | 312 | MODULE_DESCRIPTION("Generic public key cipher type"); |